Where did the spot welds go

I'm drilling the spot welds in the floor of my 75 Duster. The front passenger side the indents are there but the drivers side I cannot find any spot weld indents The only ones I see on the drivers side is above the floor seam to firewall gap on the firewall. AM I blind I see I have to drill the ones on the outside of the trans tunnel and along the sides of the tunnel in the engine compartment It looks like I will have to remove the heater box also. The pictures of the spot welds are from the passenger side

IMG_2115.JPG

IMG_2117.JPG

IMG_2118.JPG

IMG_2049.JPG

IMG_2050.JPG

IMG_2051.JPG